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Ereskovsky Et 2018 Bulgarie.Pd Sponge community of the western Black Sea shallow water caves: diversity and spatial distribution Alexander Ereskovsky, Oleg Kovtun, Konstantin Pronin, Apostol Apostolov, Dirk Erpenbeck, Viatcheslav Ivanenko To cite this version: Alexander Ereskovsky, Oleg Kovtun, Konstantin Pronin, Apostol Apostolov, Dirk Erpenbeck, et al.. Sponge community of the western Black Sea shallow water caves: diversity and spatial distribution. PeerJ, PeerJ, 2018, 6, pp.e4596. 10.7717/peerj.4596. hal-01789010 HAL Id: hal-01789010 https://hal.archives-ouvertes.fr/hal-01789010 Submitted on 14 May 2018 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Sponge community of the western Black Sea shallow water caves: diversity and spatial distribution Alexander Ereskovsky1,2, Oleg A. Kovtun3, Konstantin K. Pronin4, Apostol Apostolov5, Dirk Erpenbeck6 and Viatcheslav Ivanenko7 1 Institut Méditerranéen de Biodiversité et d'Ecologie Marine et Continentale (IMBE), Aix Marseille University, CNRS, IRD, Avignon Université, Marseille, France 2 Department of Embryology, Faculty of Biology, Saint-Petersburg State University, Saint-Petersburg, Russia 3 Hydrobiology and General Ecology Department, Marine Research Station, Odessa National I. I. Mechnikov University, Odessa, Ukraine 4 Physical and Marine Geology Department, Odessa National I. I. Mechnikov University, Odessa, Ukraine 5 Burgas University, Burgas, Bulgaria 6 Department of Earth and Environmental Sciences & GeoBio-Center, Ludwig-Maximilians-Universität München, Munich, Germany 7 Department of Invertebrate Zoology, Biological Faculty, Moscow State University, Moscow, Russia ABSTRACT Marine caves possess unique biocoenotic and ecological characteristics. Sessile benthic species such as sponges associated with cave habitats typically show a marked zonation from the cave entrance towards the end of the cave. We describe three semi-submerged karstic caves of 50 to 83 m length and 936 to 2,291 m3 volume from the poorly explored cavernicolous fauna of North-East Bulgaria. We surveyed sponge diversity and spatial variability. Eight demosponge species were identified based on morphological and molecular data, of which six are known from the adjacent open sea waters of the Black Sea. Two species, Protosuberites denhartogi van Soest & de Kluijver, 2003 and Halichondria bowerbanki Burton, 1930, are reported from the Black Sea for the first time. The spatial sponge distribution inside the caves is in general similar, but shows some differences in species composition and distribution depending on cave relief and Submitted 22 December 2017 hydrodynamics. The species composition of sponges of Bulgarian caves is found to be Accepted 20 March 2018 different from Crimean caves. An updated checklist of the Black Sea sponges is provided. Published 8 May 2018 Corresponding author Alexander Ereskovsky, Subjects Biodiversity, Marine Biology, Zoology [email protected] Keywords Bulgaria, The Black Sea, Porifera, Marine caves, Checklist, Karst cave habitat, Extreme Academic editor environment, Inventory, Cave-dwelling fauna Joseph Pawlik Additional Information and Declarations can be found on INTRODUCTION page 23 During the last decades it has repeatedly been shown that the environmental conditions DOI 10.7717/peerj.4596 in submarine caves produce a rich and diversified biota, and bear several faunistic Copyright peculiarities including `relict' species (Hart, Manning & Iliffe, 1986; Ohtsuka, Hanamura 2018 Ereskovsky et al. & Kase, 2002; Manconi, Serusi & Pisera, 2006; Manconi et al., 2009; Manconi & Serusi, Distributed under 2008; Iliffe & Kornicker, 2009; Pisera & Vacelet, 2010), bathyal forms (Harmelin, 1997; Creative Commons CC-BY 4.0 Vacelet, 1996; Glover et al., 2010; Janssen, Chevaldonné & Martínez Arbizu, 2013), and truly OPEN ACCESS troglobial taxa (Pansini, 1996; Bussotti et al., 2006; Chevaldonné & Lejeusne, 2003; Lejeusne How to cite this article Ereskovsky et al. (2018), Sponge community of the western Black Sea shallow water caves: diversity and spatial distribution. PeerJ 6:e4596; DOI 10.7717/peerj.4596 & Chevaldonné, 2005). These faunas are composed of species able to tolerate the cave conditions and possess adaptive colonization strategies. Moreover, for meiofauna (Todaro et al., 2006; Janssen, Chevaldonné & Martínez Arbizu, 2013) as well as for macrofauna, the marine caves represent hotspots of biodiversity and endemicity (Gerovasileiou & Voultsiadou, 2012). Submerged or partially submerged sea caves are protected by the EU Habitats Directive as a distinct habitat type (UNEP-MAP-RAC/SPA, 2008; Giakoumi et al., 2013). In contrast to submerged marine caves, semi-submerged caves are characterized by higher hydrodynamics, possess insenvironmental conditions on short and long term, and are rarely oligotrophic (Corriero et al., 2000). Light and water-movement variations are related to the peculiar cave characteristics in terms of morphology, dimensions, exposure, and depth. In the shallow semi-submerged, the rapid decrement of light intensity may not correspond to a similar decreasing trend of water-movement. It has been shown that more illuminated sections in caves and shallow and/or semi-submerged caves are more susceptible to marine biological invasions than darker sections (Gerovasileiou et al., 2016; Dimarchopoulou, Gerovasileiou & Voultsiadou, 2018). Sponges (Phylum Porifera) represent one of the most abundant animal phyla in many benthic ecosystems (Bell & Smith, 2004) and can constitute the dominant sessile organism group in marine cave environments (Sarà, 1962; Corriero et al., 2000; Richter et al., 2001; Bell, 2002; Gerovasileiou & Voultsiadou, 2012; Gerovasileiou & Voultsiadou, 2016; Gerovasileiou et al., 2016; Radolovi¢ et al., 2015; Ereskovsky, Kovtun & Pronin, 2016). The sponge fauna of marine semi-submerged caves has been investigated predominantly in the Mediterranean Sea (Sarà, 1958; Sarà, 1961a; Sarà, 1961b; Laborel & Vacelet, 1959; Labate, 1964; Vacelet, 1976; Vacelet, 1996; Pansini & Pronzato, 1982; Corriero et al., 1997; Corriero et al., 2000; Corriero, 1989; Knittweis et al., 2015; Dimarchopoulou, Gerovasileiou & Voultsiadou, 2018), although a few studies were performed in Ireland (Bell, 2002), in the Caribbean area (Macintyre et al., 1982; Hart, Manning & Iliffe, 1986; Kobluk & Van Soest, 1989), and the Black Sea (Ereskovsky, Kovtun & Pronin, 2016). Here, it was clearly demonstrated that superficial caves do not resemble submerged caves in terms of benthos diversity and community structure. As submarine caves (submerged and semi-submerged) are subject to severe temperature alterations attributed to global climate change (Bianchi, Morri & Russo, 2003), as well as to biological invasions (Gerovasileiou et al., 2016) and anthropogenic impacts (Nepote et al., 2017), knowledge on the Black Sea sponge diversity is vital. Submarine caves represent poorly resilient ecosystems (Harmelin, 1980; Lejeusne & Chevaldonné, 2006), therefore, understanding their recovery capacity after disturbances is mandatory for conservation. Our knowledge on the biodiversity of the Black Sea sponges is scarce; data describing the sponge diversity in its caves is practically non-existent, except for one publication on Crimean cave sponges (Ereskovsky, Kovtun & Pronin, 2016). The objectives of the present study are the description of three shallow water semi- submerged marine caves explored in the Bulgarian Black Sea coast, including the assessment of their sponge diversity and distribution as groundwork for the environmental management of coastal zones in the Black Sea. Ereskovsky et al. (2018), PeerJ, DOI 10.7717/peerj.4596 2/30 Figure 1 Location of the investigated caves in the North-East Bulgaria (Black Sea). Full-size DOI: 10.7717/peerj.4596/fig-1 MATERIAL & METHODS The research was carried out in 2016 in three semi-submerged marine caves (Budova, Tulenova and Temnata dupka) located in Dobrich province of Bulgaria and at the territory of North-Tyulenovo speleological area of the Eastern-Dobrudzha karst region (Fig. 1). The primary host rock of the caves is thickly layered or massive limestone ranging in color from light grey to white. Cave descriptions Geomorphological descriptions of the caves were conducted using classic geological and hydrobiological methods including three-dimensional mapping (Pronin et al., 2013; Ereskovsky, Kovtun & Pronin, 2016). The coordinates of the cave entrances were determined using a Garmin 12XL GPS. Depths were measured with a diving depth gauge (Mares M2) to an accuracy of 0.1 m. Underwater tunnels, domes and crevices were measured using a reinforced-plastic ruler. Underwater topographic mapping was conducted by the following technique: length and azimuth were assessed between survey pegs placed near the marine cave entrance; then an azimuthal survey was done using an underwater compass and the survey pegs; cross-sections of each cave were drawn using survey pegs. Photographs were taken with a Nikon P6000 digital camera. Ereskovsky et al. (2018), PeerJ, DOI 10.7717/peerj.4596 3/30 Specimen
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